. Elements of geology : a text-book for colleges and for the general reader. Geology. 352 PALEOZOIC SYSTEM OF ROCKS. Fortunately, our own country is supplied with almost inexhaustible stores of this source of industrial prosperity. V Origin of Coal, and of its Varieties. That coal is of vegetable origin is now no longer doubtful. We will only briefly enumerate the evidences on which is based the present scientific unanimity on this subject: 1. The remains of an extinct vegetation are found in abundance in immediate connection with coal-seams; stumps and roots in the under- clay, and leaves and
. Elements of geology : a text-book for colleges and for the general reader. Geology. 352 PALEOZOIC SYSTEM OF ROCKS. Fortunately, our own country is supplied with almost inexhaustible stores of this source of industrial prosperity. V Origin of Coal, and of its Varieties. That coal is of vegetable origin is now no longer doubtful. We will only briefly enumerate the evidences on which is based the present scientific unanimity on this subject: 1. The remains of an extinct vegetation are found in abundance in immediate connection with coal-seams; stumps and roots in the under- clay, and leaves and stems in the black slate in contact with the seam and even imbedded in the seam itself. 2. These vegetable remains are not only associated with the coal-seam, but have often themselves be- come coal, though still retaining their original form and structure. 3. Not only these easily-recognizable imbedded vegetable fragments, but the imbedding substance also, the whole coal-seam, even the most structureless portions, and the hardest varieties, such as anthracite, when carefully prepared in a suitable manner and examined with the microscope, show vegetable structure. Even the ashes of coal, carefully examined, show vegetable cells with characteristic markings. The fol- lowing figures show the results of such examination. 4. A perfect gra-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original LeConte, Joseph, 1823-1901. New York : D. Appleton and Co.
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